Floor-jack.



W. H. CHAMBERLAIN & F. A. HADLBY.

FLOOR JACK.

APPLIGATION r1LEpsBPT-2, 1911.

.,.3,927. l Patented Jan.9,1912.

To all whom it may concern.'

Be it known that we, ll/ILLIAM H. CHAM- nsnLAiN andv FRANK A. HADLEY, citizens of the United States, both residing atlVoi-cester, in the county of lorcester and State of lnhissachusetts, have invented a. new and useful Floor-J ack, of which the following is a specification.

This invention relates to a jack which while capable of sonie other uses is particularly adapted for laying` floors andmatchingl up boards for other purposes.

"The principal objects of the invention are to provide a powerful and quick-acting deviceI oit.' this character consisting of only three parts outside the connect-ing pivot pins and arranged in such a way that it can be operated in a very simple manner, and provide a great leverage.

Further objects and advantages ol. the invention will appear hereinafter.

Reference is to be had to the ing drawings in which Figure 1 is a side elevation of a preferred forni of the inventionshowing it as just ready to operate; and Fig. 2 is a front view thereof.

The invention is shown in a form in 'which it comprises a brace-bar 10 having a spur or dog 11 at the rear end adapted to he driven into planking or the like. This brace-har is provided witha -rack 12 along the lower side thereof. Pivoted to the front end ot the brace bar is an operating handle 13 which extends below the pivot 14, by which it is connected with the brace-bar and is provided on its end with a pivot 15 by which it is connected with a' pair ot ears 16 on a hlock 17. rlrhis block is designed to engage the board to be set up into position, and is provided at the rear thereof with a push bar 18 in the plane of the block. This push bar is arranged in this plane so that it may rest on the. planhing or other support on which the lfloor is laid. This plane is 'iarallel with the brace bar. [it its rear it is provided with a fixed integral awl 19 extending rearwardly and upaccompany- Ward'y into engagement with the teeth of the-rack 12. u 1

1n use the spur 11 is driven into the Specification of ,Letters Patent.

Application filed September 2, 1913..

i a rioni "fra were if-fara Baal il l' nella@ Patented dan.. 9, 1912. Serial No. 647,358.

stationary object and the up against the board A planhing or other block 17 is placed to be set up. The parts are so arranged and block down against the planking and absolutely prevents any sidewise motion or tip-l pingof the block. As the handle is pushed down the paw travels along the rack 1 2 and all the motion that is gained by the swinging of the handle is retained by the pawl entering the `Vsuccessive notches of the raclr. ln this way no time is lost in holding' the board in the position to which it is forced by the hand e as it will be kept there by 'the jack itself. .it will be seen therefore, that all the results desired in this class of work are secured by means of this device which consists practically of only three pieces, the brace-bar, push-bar and lever.

Although we have illust-rated and described a preferred embodiment of the invention, we are aware that many modifications 'can be made therein by any person skilled in the art without departingfrom the scope of the invention as expressed in the claims. Therefore, we do not wish to be limited to all the details of construction herein shown and described, but

V/lhat we do claini is 1. ln a floor jack, the combination with a brace bar having a spur or dog at one end, and a rack along the underside thereof, of an operating lever fulcrun'ied at the other end of said brace bar and extending loeyond thelsaine, and a push bar pivoted to the end of said lever and having a pavvl extending rearwardly and upwardly therefrom into position to engage said raclr.

2. ln floor jaclr, the combination with a brace bar having a spur or dogg; and a. rash along the underside thereof, of an cperatin,glil

. lever fulcrumed :Lt the end of said brace Set 'our hamis, in the presence of two suh- 1: bai', and :i push bei" having a fixed block and' seribing Witnesses.

" pivoted to the lever at a, point above he VILLIAM H. CHAMBERLAN.

block and having an integral rear extension FRANK A. HADLEY. 5; in the plane of the block extending u Witnesses:

' Waidly ab the end into Contact with the rac C., FoRREsT WESSQN,

In tesilmony whereof We have hereunto CATHARINE IMELDA HARTNETT. 

